HDFS-9937. Update dfsadmin command line help and HdfsQuotaAdminGuide. Contributed by Kai Sasaki.

(cherry picked from commit 25f0a9b3ab)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java

@@ -165,7 +165,7 @@ private static class SetQuotaCommand extends DFSAdminCommand {
     private static final String NAME = "setQuota";
     private static final String USAGE =
       "-"+NAME+" <quota> <dirname>...<dirname>";
-    private static final String DESCRIPTION = 
+    private static final String DESCRIPTION =
         "-setQuota <quota> <dirname>...<dirname>: " +
         "Set the quota <quota> for each directory <dirName>.\n" +
         "\t\tThe directory quota is a long integer that puts a hard limit\n" +
@@ -217,7 +217,13 @@ private static class ClearSpaceQuotaCommand extends DFSAdminCommand {
     "\t\t1. the directory does not exist or is a file, or\n" +
     "\t\t2. user is not an administrator.\n" +
     "\t\tIt does not fault if the directory has no quota.\n" +
-    "\t\tThe storage type specific quota is cleared when -storageType option is specified.";
+    "\t\tThe storage type specific quota is cleared when -storageType option is specified." +
+    "\t\tAvailable storageTypes are \n" +
+    "\t\t- RAM_DISK\n" +
+    "\t\t- DISK\n" +
+    "\t\t- SSD\n" +
+    "\t\t- ARCHIVE";
+
 
     private StorageType type;
 
@@ -275,7 +281,12 @@ private static class SetSpaceQuotaCommand extends DFSAdminCommand {
         "\t\t1. quota is not a positive integer or zero, or\n" +
         "\t\t2. user is not an administrator, or\n" +
         "\t\t3. the directory does not exist or is a file.\n" +
-        "\t\tThe storage type specific quota is set when -storageType option is specified.\n";
+        "\t\tThe storage type specific quota is set when -storageType option is specified.\n" +
+        "\t\tAvailable storageTypes are \n" +
+        "\t\t- RAM_DISK\n" +
+        "\t\t- DISK\n" +
+        "\t\t- SSD\n" +
+        "\t\t- ARCHIVE";
 
     private long quota; // the quota to be set
     private StorageType type;
@@ -570,7 +581,7 @@ public void report(String[] argv, int i) throws IOException {
 
   /**
    * Safe mode maintenance command.
-   * Usage: hdfs dfsadmin -safemode [enter | leave | get]
+   * Usage: hdfs dfsadmin -safemode [enter | leave | get | wait | forceExit]
    * @param argv List of of command line parameters.
    * @param idx The index of the command that is being processed.
    * @exception IOException if the filesystem does not exist.
@@ -1778,7 +1789,8 @@ private static void printUsage(String cmd) {
                          + " [-refreshCallQueue]");
     } else if ("-reconfig".equals(cmd)) {
       System.err.println("Usage: hdfs dfsadmin"
-          + " [-reconfig <namenode|datanode> <host:port> <start|status>]");
+          + " [-reconfig <namenode|datanode> <host:port> "
+          + "<start|status|properties>]");
     } else if ("-refresh".equals(cmd)) {
       System.err.println("Usage: hdfs dfsadmin"
                          + " [-refresh <hostname:port> <resource_identifier> [arg1..argn]");

hadoop-hdfs-project/hadoop-hdfs/src/site/markdown/HdfsQuotaAdminGuide.md

@@ -100,14 +100,17 @@ Quotas are managed by a set of commands available only to the administrator.
     gigabytes and 2t for 2 terabytes etc. Best effort for each
     directory, with faults reported if N is neither zero nor a positive
     integer, the directory does not exist or it is a file, or the
-    directory would immediately exceed the new quota.
+    directory would immediately exceed the new quota. The storage type
+    specific quota is set when -storageType option is specified. Available
+    storageTypes are RAM_DISK,DISK,SSD,ARCHIVE.
 
 *   `hdfs dfsadmin -clrSpaceQuota -storageType <storagetype> <directory>...<directory>`
 
     Remove storage type quota specified for each directory. Best effort
     for each directory, with faults reported if the directory does not exist or
     it is a file. It is not a fault if the directory has no storage type quota on
-    for storage type specified.
+    for storage type specified. The storage type specific quota is cleared when -storageType
+    option is specified. Available storageTypes are RAM_DISK,DISK,SSD,ARCHIVE.
 
 Reporting Command
 -----------------